Electric motor



(No Model.)

M. J. WIGHTMAN 85 0. 0. G. URBAN. ELECTRIC MOTOR.

No. 551,557. v Patented Dec. 17; 1595.

i i 7 .3 1.1 g

I }a vI I 3. 5 $23 l m 15 hfiovna M v. m WRJ embodying our invention.

UNITED STATES PATENT OFFICE.

MERLE J. VIGHTMAN AND OSCAR C. G. URBAN, OF CLEVELAND, OHIO.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 551,567, dated December17, 1895.

Application filed May 16, 1893. Renewed May 15, 1895. Serial No.549,445. (No model.)

T 0 all whom it may concern.-

Beit known that we, MERLE J. XVIGHTMAN and OSCAR C. G. URBAN, ofCleveland, in the county of Cuyahoga and State of Ohio, have inventedcertain new and useful Improvements in Electric Motors; and we do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use the same.

Our invention relates to improvements in electric motor, and moreespecially to the con struction and arrangement of pole-pieces for afourpole motor.

In the accompanyingdrawings, Figure 1 is an end view in section of afour-pole motor Figs. 2 and 3 are perspective views respectively of thetwo sec t-ions of one of the side pole-pieces.

A represents the frame of the motor, the same being a box-slidestructure,-having bottom, side, and end walls cast integral and having aremovable cover A. The bottom wall of the frame has an integralpole-piece a and the cover has an integral pole-piece a. The sidepole-pieces are supposed to be alike, and are each constructed in twosections 13 and C. Sections 13 B respectively engage, internally, theside walls of the motor-frame, and sections 0 C engage sections B B inthe manner shown in Fig. 1. The securing-bolts b b extend with easy fitsthrough holes in the side walls of the motor-frame and through holes insections B B, and screw into screwthreaded holes in section C.

The cover of the motor-frame having been removed, by firstremoving-bolts Z), the back sections B of the side pole-pieces can beremoved, after which sections C can be moved back from the armature farenough to admit of removing the armature from the frame, as isoccasionally necessary in making repairs.

In assembling the parts, the armature having been placed in position,sections C are moved to or toward the armature to make room forinserting sections B, after which bolts C are inserted and screwed hometo hold the pole-pieces rigidly in position.

The side field-coils are each constructed in two sections for the reasonthat if constructed in one broad coil sections B of the polepieces couldnot be removed. The outer section D of each field -coil encirclessection B of the pole-piece, and is removed and returned with member B.Section E of each side fieldcoil encircles section C of the opposingpolepiece, and consequently member E need not be removed in removing thearmature. The Wires of sections D and E of each field'coil are of courseconnected and such connection of these wires is usually made on top,where they are accessible when cover A is removed, and any variety ofcoupling that can be easily manipulated will answer the purpose.

In connecting the motor after the pole-pieces are assembled the faces ofthe pole-pieces are bored concentric with the axis of the armature, thecircumferential line or face of the armature being indicated by thecircle at 0.

hat we claim is 1. An electric motor having a pole piece c011- structedin two sections, the rearward or outer section whereof is removablewhereby the inner section thereof is capable of being moved outwardly orbaekwardly from the armature, substantially as and for the purpose setforth.

2. A four pole electric motor, two opposite poles whereof areconstructed each in two sections, the outer section being removable, incombination with field coils constructed in two sections to correspondwith the co-operatin g sections of the pole-pieces, substantially as setforth.

3. A four pole electric motor the side poles of which are constructedeach in two sections, the rearward or outer sections whereof areremovable whereby the inner sections thereof may be moved outward orback from the armature, substantially as, and for the purpose set forth.

4. A four pole electric motor two opposite poles of which areconstructed each in sections whereof the outer sections are removablecombined with field coils constructed in sections to correspond with thecooperating sections of the pole pieces, substantially as described.

111 testimony whereof we sign this specification, in the presence of twowitnesses, this 13th day of May, 1893.

MERLE J. IVIGI-ITMAN. OSCAR C. G. URBAN. Witnesses:

12. W. AYLWORTH, G. O. NASH.

